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_ <br /> July 8, 1988 AGS Job No. 38032-1 <br /> UNOCAL S+ rvice Station No. 6981, Stockton, California <br /> both ends of each former storage tank. The native soil consists <br /> of orango- to gray-brown clayey silt at the depths sampled. <br /> Obvious moderate to strong hydrocarbon odor, inferr♦ed to be <br /> gasoline, was present in the vicinity of the tank cavity. The <br /> geologist onsite noted an olive-green to gray disccloration in <br /> the native material tinder the eastern 'two tanks. Evidence of <br /> soil contamination was also noted under the fill end of Tank T-1. <br /> Soil samples were collected from the base of the tank cavity by <br /> excavating below the former tanks with the hoptoe. Each sample <br /> was collected using a hand-operated percussioi; sampler to drive a <br /> clean bre^.s sample sleeve into the soil in the hoptoe bucket <br /> immediately after it was brought to the surface. Vie sleeve was <br /> removed from the sampler and sealed with aluminum fc:il, plastic <br /> i <br /> caps and airtight tape. The sample was then labelec. a-I placed <br /> in iced storage. The samples were given sample identifications <br /> designating the approximate depth of the sample and the location 4i <br /> of the sample in the tank cavity. 7 <br /> The sample locations are shown or. the Sample Location Nap. A <br /> Chain of custody Record was initiated by the geologist in the <br /> field and accompanied the samples to the analytical laboratory. <br /> E copy of this record is included in the Appendix to this report. <br /> 9 <br />